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Regulator of gamma-secretase activity, which specifically activates the production of beta-amyloid protein (beta-amyloid protein 40 and beta-amyloid protein 42), without affecting the cleavage of other gamma-secretase targets such has Notch. The gamma-secretase complex is an endoprotease complex that catalyzes the intramembrane cleavage of integral membrane proteins such as Notch receptors and APP (beta-amyloid precursor protein). Specifically promotes the gamma-cleavage of APP CTF-alpha (also named APP-CTF) by the gamma-secretase complex to generate beta-amyloid, while it reduces the epsilon-cleavage of APP CTF-alpha, leading to a low production of AICD.

Accumulation of neurotoxic amyloid-beta is a major hallmark of Alzheimer disease (AD; MIM 104300). Formation of amyloid-beta is catalyzed by gamma-secretase (see PSEN1; MIM 104311), a protease with numerous substrates. PION, or GSAP, selectively increases amyloid-beta production through a mechanism involving its interaction with both gamma-secretase and its substrate, the amyloid-beta precursor protein (APP; MIM 104760) C-terminal fragment (APP-CTF) (He et al., 2010 [PubMed 20811458]).[supplied by OMIM, Nov 2010]

Protocols for recombinant bacterial expression and purification of potentially important protein GSAP are not successful in generating soluble forms of GSAP that contain well-ordered and homogeneous tertiary structure.

Aberrant regulation of gamma-secretase activating protein expression plays a key role in acceleration of gamma-cleavage of beta-secretase-cleaved C-terminal fragment of amyloid precursor protein and accumulation of Abeta in AD brains

A gamma-secretase activating protein (GSAP) that selectively increases amyloid-beta production via interactions with both gamma-secretase and its substrate, the amyloid precursor protein carboxy-terminal fragment.